The Globe and Mail reports in its Tuesday edition that Parkland shares jumped more than 5 per cent on Monday as a war of words with its largest shareholder escalated, and investors wagered that the gas-station and convenience-store operator could be a takeover target. The Globe's Jeffrey Jones writes that Simpson Oil Ltd., which owns 19.7 per cent of Parkland, called late last week for the Calgary-based company to launch a strategic review "including a potential transition of the company to new ownership." Simpson Oil argued such an examination is crucial to improving Parkland's operations and financial performance. It said it would be open to a deal under which Parkland shareholders would exchange their stock with those of another operator that could boost value, optimize the company's assets and allocate capital more diligently than the current management group. "As a supportive partner, we have consistently encouraged the company to maximize value and returns to shareholders. The results have fallen short of our expectations," Simpson Oil said in its statement. Parkland said on Sunday a review is unnecessary and would not benefit investors. On Monday, Parkland rose $2.18 to $43.12 on the Toronto Stock Exchange.